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Getting ROI data from an image [message #77867]

Fri, 30 September 2011 10:50

Rebecca
Messages: 4
Registered: October 2011

Junior Member

I need to extract hyperspectral data from an image ROI :

The project I'm working on requires me to code strictly with IDL, so I
cannot use ENVI calls in the final product. I am running unsupervised
classification (K-Means), which returns a classification image with
each pixel assigned a number from [0,..nClasses]. I want to use the
classification image to subset the image based on ROI and get the mean
spectra from each class. The functionality I need is probably the same
as ENVI_GET_ROI_DATA(). My exact question is, how can I use the one-
dimensional calls to capture ROI data from the hypersepctral data?

samples = 320
lines = 1000
bands = 300
classes = 15

result = KMEANS(img, ITERATIONS = 4, NCLASSES = classes)

FOR i = 0, nClasses-1 DO BEGIN
loc = WHERE(result EQ i, count)
IF count EQ 0 THEN CONTINUE

; ?

; ?

ENDFOR

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